In-situ growth of low-dimensional perovskite-based insular nanocrystals for highly efficient light emitting diodes  

作　　者：Hao Wang Weidong Xu Qi Wei Si Peng Yuequn Shang Xianyuan Jiang Danni Yu Kai Wang Ruihua Pu Chenxi Zhao Zihao Zang Hansheng Li Yile Zhang Ting Pan Zijian Peng Xiaoqin Shen Shengjie Ling Weimin Liu Feng Gao Zhijun Ning 

机构地区：[1]School of Physical Science and Technology,Shanghai Key Laboratory of High-resolution Electron Microscopy,ShanghaiTech University,Shanghai,China [2]Institute of Flexible Electronics,Northwestern Polytechnical University,Xi’an,China [3]Department of Physics,Chemistry and Biology(IFM),Linköping University,Linköping,Sweden

出　　处：《Light(Science & Applications)》2023年第3期446-455,共10页光（科学与应用)（英文版）

基　　金：The authors gratefully acknowledge financial support from the National Natural Science Foundation of China(Nos.61935016,92056119,22175118,62288102,62274135);National Key Research and Development Program of China(under Grants No.2021YFA0715502);Double First-Class Initiative Fund of ShanghaiTech University,and the Science and Technology Commission of Shanghai Municipality(Nos.20XD1402500 and 20JC1415800);Bertil och Britt Svenssons Stiftelse and Swedish Energy Agency(P2022-00394);The authors appreciate the Instrument Analysis Center and Centre for High-resolution Electron Microscopy(CħEM)and the high-performance computing(HPC)Platform of ShanghaiTech University.The authors gratefully thank professor John A.McGuire for the helpful discussion.

摘　　要：Regulation of perovskite growth plays a critical role in the development of high-performance optoelectronic devices.However,judicious control of the grain growth for perovskite light emitting diodes is elusive due to its multiple requirements in terms of morphology,composition,and defect.Herein,we demonstrate a supramolecular dynamic coordination strategy to regulate perovskite crystallization.The combined use of crown ether and sodium trifluoroacetate can coordinate with A site and B site cations in ABX_(3) perovskite,respectively.The formation of supramolecular structure retard perovskite nucleation,while the transformation of supramolecular intermediate structure enables the release of components for slow perovskite growth.This judicious control enables a segmented growth,inducing the growth of insular nanocrystal consist of low-dimensional structure.Light emitting diode based on this perovskite film eventually brings a peak external quantum efficiency up to 23.9%,ranking among the highest efficiency achieved.The homogeneous nano-island structure also enables high-efficiency large area(1 cm^(2))device up to 21.6%,and a record high value of 13.6%for highly semi-transparent ones.

关 键 词：STRUCTURE PEROVSKITE enable 

分 类 号：TN312.8[电子电信—物理电子学]